1.4303 (X4CrNi18-12) Material Data Sheet

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1.4303 directly from stock & cut to your required dimensions!

International identifiers
AISI 305/308, AFNOR Z5CN18-11FF, BS 305S17/305S19, UNS S30500, JIS305

1.4303 - X4CrNi18-12 is a low decarburrized, austenitic stainless steel in many applications. There is the advantage in high-alloyed nickel content to increased resistance to corrosion compared with 1.4301 or 1.4306.

The field of application contains chemical industry, mechanical engineering, electronic equipment, food and beverage industry and automotive industry. In addition, this stainless material is often selected for bolts, studs, and nuts (turbine industry). 


The material 1.4303 X4CrNi18-12 is good suitable for welding constructions. An interpass temperature of 150°C should not be exceeded and a post weld heat treating (PWTH) is not necessary. It´s possible to get tempering colours that results from the heat of welding, which is removeable by grinding to restore the corrosion resistance.

Mechanical Properties:

Hardness:max. 215 HBW
0,2 %-Yield strength:> 180 MPa
Tensile strength:460 to 680 MPa
Reduction in area (transverse):min. 35%
Impact test (ISO-V) longitudinal:min. 60 J

Diagramm 1.4303

Special properties

  • Usable up to 600°C

  • Excellent cold formability

Typical physical properties of 1.4303, annealed condition

Density [kg/m³]7,9
Elastic modulus [GPa]193
Magnetic permeability1,02 (nonmagnetic)
Electrical resistivity at 20°C [Ohm*mm²/m]0,73
Specific heat capacity at 20°C [J/kg*K]500
Thermal conductivity at 20°C [W/m*K]15
Thermal conductivity at 100°C [W/m*K]16,2
Thermal conductivity at 500°C [W/m*K]21,5
Mean coefficient of Thermal expansion between 0 to 100°C17,2
Mean coefficient of Thermal expansion between 0 to 315°C17,8
Mean coefficient of Thermal expansion between 0 to 538°C18,4

Heat treatment (annealing)

Material 1.4303 must be annealed at 1010°C (1850°F) – 1121°C (2050°F) held for minimum 1 hour per 25 mm (1 inch) of thickness and water quenched subsequently. Prolonged exposure between 430°C (800°F) – 650°C (1200°F) must be avoided to prevent embrittlement and loss of corrosion properties. This austenitic grade does not harden by heat treatment.


1.4303 is usually slowly heated to within the temperature range 1150°C - 1200°C to allow forging which takes place at temperatures between 1200°C and 900°C. Forging is followed by air cooling, or water quenching when no danger of distortion exists.


Due to of increased Ni-content and the less Carbon content is the austenitic structure more stable. That´s why there is a lower tendency to work harden when machined. In case of machining 1.4303, the following cutting parameters can be used only as a range for cutting speed of 140 to 260 m/min in dependence of the depth of cut and feed rate (0,5 bis 0,2 mm per turn). The material 1.4303 isn´t suitable for use in automated machining.

Processing properties

Hammer and die forgingyes
Cold formingyes
Cold headingyes
Blanking and Piercingpossible
Deep drawingpossible
Press-brake formingyes

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Chemical composition
min.   --17,0 
In stock

Forged flat material, solution annealed and quenched, pre machined

Advantages of saw cut

The machining by our saws is a mechanical step of processing of this material products, which results in a significantly lower unintended deformation and increased hardness for the existing  structure, such as the thermal cutting. This approach allows finishing of the workpiece by milling or drilling, immediately. So it isn´t necessary to anneal the material or make any similar operation beforehand.

Do you have any questions?

We are happy to answer your questions and make you an offer for these and other materials. Contact us now for more information.

Heidi Sommer

Your contact person Heidi Sommer+49 (0) 35263-665-33

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Notice: Specifications contained in following data sheet are provided as a description, liability is excluded!


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